Cutting blade for pile wire



Feb. 3. 1 2 1,524,701

- F. FARMER CUTTING BLADE FOR FILE WIRE Filed Oct. 29, 1925 Patented Feb. 3, 1925.

I new so F QK. 353M331. W QETEB1 M 51 HU ETT$1 CUTTING BLADE Eon; Pins; WIRE.

Application; filed 0otob'ere29,.1923i SerialzflNo. 6713487.-

.[loaZZ. whom it may. concern:

Be it known that: I, FREnn rc1e FAR- me; a, cit zen; of the United States... residing. at;

Vorcester. in the county of Vorcester; and.

S a en-f Massachusetts.have inventerla new and useful Cutting Bladefon-Bile:Viiiregof; which the following is a specification.

This-.invention'relates to .pi1e wires used for cutting the pile in the manufacture of carpets, rugs, and similar fabrics.

The principal objects of the invention are to provide a. pile wire with a readily detachable and replaceable blade so that the blade can be taken out and sharpened and replaced without injuring the pile wire or modifying it in any way or even changing its position and to provide a. simple and convenient means for preventing accidental displacement. The invention alsoinvolves improvements in the details of the pile wire itself for adapting it for use with the detachable blade.

Reference is to be had to the accompanying drawings in which Fig. 1 is a side elevation of the forward end. portion of a. pile wire constructed in accordance with this invention;

Fig. 2 is a similar view showing the blade swung upwardly on its pivot to detach it;

Fig. 3 is a similar view showing the blade entirely detached and illustrating the pile wire in longitudinal central section;

Fig. t is a. plan of the pile wire with the parts in the position shown in Fig. 1; and

Fig. 5 is a side view of a modified form.

For the purpose of securing the above mentioned results I form the pile wire 10 either in the form of a tube flattened out so as to have considerable depth and slit along the top side, or in the form of two side plates or pieces connected by a bottom piece and open at the top, or by slotting the end of a solid piece of wire as in Fig. 5. In either case this forms a deep trough all along the end port-ion of the pile wire, but terminating short of the point 12 itself. In Fig. 1 the top of the wire is closed along the surface 12 at the point to form a stop at the end of this closure. A cross wire 13 is provided in Fig. 5. Underneath this closure 12 or wire 13 the passage in the pile wire extends forwardly to form apocket at 15 for the purpose to be described.- The endf'ofwtheiflpile, wire is shown. curved as usual;

. Theibla de.orgcutterzconsists of agenerally. h

triangular: piece of: sheet steel; 20. This ise ero ided itgln rwardlynroj ating. ongue 2. 1 he -9h e d ththe su an ecutr ting redg e ontheslantingsurfarie.' This fore,

r i rrwea nge ets en he Wrasse of extending into the'pocket 15 and holding that end of the blade in position.

The two side walls 11 of the pile wire are just far enough apart to grip the sides of the blade and hold it friotionally, but I prefer not to depend on that, but to provide the blade with a perforation 22 or at least an indentation at this point and to set in a projection 18 into one or both sides of the pile wire just in position to fit in this perforation or indentation when the cutter is moved clear up to the stop on the top of the point on the wire. This holds the cutter against accidental displacement.

When it is desired to remove the cutter it is first swung upwardly into the position shown in Fig. 2 about its forward projection as a center. This ordinarily has to be done by using a pair of pliers or by inserting a pin in the hole 23 to pull it out against the resistance of this projection 18. After the cutter gets out to this position it is moved upwardly and backwardly by the pliers or the fingers as indicated in Fig. 3 so that it is entirely detached. It can then be sharpened or replaced by another cutter of the same size and shape and can be forced back in by the use of the hands without the employment of pliers. The operator can get all the pressure needed between his thumb and finger, one being on top of the cutter and the other on the bottom of the pile wire.

In this way the cutter blades are readily applied and detached without the use of special tools, and they are firmly held in position while they are in use. A pile wire 9 will outlast numerous blades and its life is not reduced by the occasional replacement of a blade. This constitutes a simple and convenient solution of one of the problems in this art.

On account of the factthat the blade abuts against the stop at the point} and projects under it, the motion of the pile wirefor the purpose of cutting tends to set the bladeback against this stop and revents accidental displacement of the bla e at that time. In other words, the stop backs up the blade and provides a solid surface to pull it through the fabric.

Although I have illustrated and described only a single form of blade and only three forms of pile wires, I am aware of the fact that modifications can be made in both without departing from the scope of the invention as expressed in the claims. Therefore I do not wish to be limited to the exact form shown, but what I do claim is 1. The combination with a pile wire having a pair of side walls spaced a short distance apart, of a cutting blade mounted be tween said walls and held between them by friction, said walls having a stop extending across the top of the space between them near the point of the pile wire, against which stop the cutting blade abuts to hold it in position while cutting, the wire and blade having a projection and depression at a. distance from each end of the blade for preventing accidental detachment of the blade.

2. The combination with a pile wire having a pair of substantially parallel side walls of uniform height and provided with a fiat stop connecting them near the point and at the upper edge only, of a cutting blade located between said walls and having a. flat topped forward projection located entirely between said walls and extending into the space between the walls under said stop, whereby the blade cannot be removed except by swinging its rear end outwardly away from the pile wire in a path curving about said stop.

In testimony whereof I have hereunto affixed my signature.

FREDERICK FARMER. 

